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Definitions

• the present disclosure relates to an organic electroluminescent compound and an organic electroluminescent device comprising the same.
• OLED organic electroluminescent device
• TPD/A1q3 bilayer consisting of a light-emitting layer and a charge transport layer. Since then, the research on an OLED has been rapidly carried out, and it has been commercialized.
• An OLED changes electric energy into light by applying electricity to an organic light-emitting material, and commonly comprises an anode, a cathode, and an organic layer formed between the two electrodes.
• the organic layer of the OLED may comprise a hole injection layer, a hole transport layer, a hole auxiliary layer, a light-emitting auxiliary layer, an electron blocking layer, a light-emitting layer (containing host and dopant materials), an electron buffer layer, a hole blocking layer, an electron transport layer, an electron injection layer, etc., if necessary.
• the materials used in the organic layer can be classified into a hole injection material, a hole transport material, a hole auxiliary material, a light-emitting auxiliary material, an electron blocking material, a light-emitting material, an electron buffer material, a hole blocking material, an electron transport material, an electron injection material, etc., depending on functions.
• the most important factor determining luminous efficiency in an OLED is light-emitting materials.
• the light-emitting materials are required to have the high quantum efficiency, high movement degree of an electron and a hole, and uniformality and stability of the formed light-emitting material layer.
• the light-emitting material is classified into blue, green, and red light-emitting materials according to the light-emitting color, and further includes yellow or orange light-emitting materials.
• the light-emitting material is classified into a host material and a dopant material in a functional aspect. Recently, an urgent task is the development of an OLED having high efficiency and long lifespan.
• a host material should have high purity and a suitable molecular weight in order to be deposited under vacuum. Furthermore, a host material is required to have high glass transition temperature and pyrolysis temperature to achieve thermal stability, high electrochemical stability to achieve a long lifespan, easy formability of an amorphous thin film, good adhesion with adjacent layers, and no movement between layers.
• Korean Patent No. 1627750 discloses a benzo[a]indolo[3,2-c]carbazole structure
• Korean Patent Application Laid-Open No. 2015-135109 discloses a dibenzocarbazole linked with a heteroaryl moiety such as quinazoline or quinoxaline via a single bond or linker.
• the above documents do not specifically disclose the structure in which residues of the backbone are further fused. The development for improving the performance of an OLED is still required.
• the objective of the present disclosure is to provide an organic electroluminescent compound effective for producing an organic electroluminescent device having low driving voltage and/or improved lifespan properties.
• X 1 represents NR 11 , O, S, or CR 21 R 22 ;
• R 11 and R 12 are represented by -L-Ar;
• Ar, and R 1 to R 3 each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri
• L represents a single bond, a substituted or unsubstituted (C1-C30)alkylene, a substituted or unsubstituted (C6-C30)arylene, a substituted or unsubstituted (3- to 30-membered)heteroarylene, or a substituted or unsubstituted (C3-C30)cycloalkylene; with a proviso that if Ar represents hydrogen, L represents a single bond;
• R 21 and R 22 each independently, represent a substituted or unsubstituted (C1-C30)alkyl, or a substituted or unsubstituted (C6-C30)aryl; or may be linked to an adjacent substituent to form a spirofluorene form; and
• a represents an integer of 1 to 6
• b and c each independently, represent an integer of 1 to 4, where if a to c, each independently, are an integer of 2 or more, each of R 1 to R 3 may be the same or different.
• the organic electroluminescent compound according to the present disclosure can provide an organic electroluminescent device having low driving voltage and/or improved lifespan properties.
• organic electroluminescent compound in the present disclosure means a compound that may be used in an organic electroluminescent device, and may be comprised in any layer constituting an organic electroluminescent device, as necessary.
• organic electroluminescent material in the present disclosure means a material that may be used in an organic electroluminescent device, and may comprise at least one compound.
• the organic electroluminescent material may be comprised in any layer constituting an organic electroluminescent device, as necessary.
• the organic electroluminescent material may be a hole injection material, a hole transport material, a hole auxiliary material, a light-emitting auxiliary material, an electron blocking material, a light-emitting material layer (containing host and dopant materials), an electron buffer material, a hole blocking material, an electron transport material, an electron injection material, etc.
• X 1 represents NR 11 , O, S, or CR 21 R 22 ; and R 11 and R 12 , each independently, are represented by -L-Ar;
• L represents a single bond, a substituted or unsubstituted (C1-C30)alkyl(ene), a substituted or unsubstituted (C6-C30)aryl(ene), a substituted or unsubstituted (3- to 30-membered)heteroaryl(ene), or a substituted or unsubstituted (C3-C30)cycloalkyl(ene); with a proviso that if Ar represents hydrogen, L represents a single bond.
• L represents a single bond, a substituted or unsubstituted (C6-C25)aryl(ene), or a substituted or unsubstituted (5- to 25-membered)heteroaryl(ene).
• L represents a single bond, an unsubstituted (C6-C18)arylene, or an unsubstituted (5- to 18-membered)heteroarylene.
• L may represent a single bond, an unsubstituted phenylene, an unsubstituted pyridylene, an unsubstituted pyrimidinylene, an unsubstituted quinazolinylene, an unsubstituted quinoxalinylene, an unsubstituted carbazolylene, an unsubstituted benzofuropyrimidinylene, or an unsubstituted benzothiopyrimidinylene.
• R 1 to R 3 , and Ar each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi
• Ar represents hydrogen, a (C6-C25)aryl unsubstituted or substituted with a (C1-C30)alkyl or a cyano, a (5- to 25-membered)heteroaryl unsubstituted or substituted with a (C6-C25)aryl, or an unsubstituted di(C6-C18)arylamino.
• Ar represents a (C6-C18)aryl unsubstituted or substituted with a (C1-C 6 )alkyl or a cyano, a (5- to 20-membered)heteroaryl unsubstituted or substituted with a (C6-C18)aryl, or an unsubstituted di(C6-C18)arylamino.
• Ar may represent a phenyl unsubstituted or substituted with a cyano; naphthylphenyl; naphthyl; biphenyl; dimethylfluorenyl; phenanthrenyl; dimethylbenzofluorenyl; triphenylenyl; terphenyl; diphenyltriazinyl; phenylbiphenyltriazinyl; dibenzofuranyl; dibenzothiophenyl; phenylcarbazolyl; diphenylquinazolinyl; diphenylquinoxalinyl; or diphenylamino.
• R 1 to R 3 each independently, represent hydrogen, or a substituted or unsubstituted (C6-C25)aryl; or may be linked to an adjacent substituent to form a substituted or unsubstituted (3- to 30-membered) mono- or polycyclic ring.
• R 1 to R 3 each independently, represent hydrogen, or an unsubstituted (C6-C18)aryl.
• R 1 to R 3 each independently, may represent hydrogen or phenyl.
• R 21 and R 22 each independently, represent a substituted or unsubstituted (C1-C30)alkyl, or a substituted or unsubstituted (C6-C30)aryl; or may be linked to an adjacent substituent to form a spirofluorene form.
• R 21 and R 22 each independently, represent a substituted or unsubstituted (C1-C10)alkyl; or may be linked to an adjacent substituent to form a spirofluorene form.
• R 21 and R 22 each independently, represent an unsubstituted (C1-C6)alkyl.
• R 21 and R 22 each independently, may represent a methyl.
• a represents an integer of 1 to 6
• b and c each independently, represent an integer of 1 to 4, where if a to c, each independently, are an integer of 2 or more, each of R 1 to R 3 may be the same or different.
• a to c each independently, represent 1 or 2.
• a to c each independently, represent 1.
• the compound represented by formula 1 may be represented by any one of the following formulas 2 and 3.
• X 1 represents O, S or CR 21 R 22 , and R 21 and R 22 , each independently, represent an unsubstituted (C1-C10)alkyl
• R 11 and R 12 each independently, are represented by -L-Ar
• L represents a single bond, an unsubstituted (C6-C25)arylene, or an unsubstituted (5- to 25-membered)heteroarylene
• Ar represents a (C6-C25)aryl unsubstituted or substituted with a (C1-C30)alkyl or a cyano, a (5- to 25-membered)heteroaryl unsubstituted or substituted with a (C6-C25)aryl, or an unsubstituted di(C6-C25)arylamino
• R 1 to R 3 each independently, represent an unsubstituted (C6-C25)aryl
• R 11 and R 12 each independently, are represented by -
• the compound represented by formula 1 may be represented by any one of the following formulas 4 to 6.
• X 1 , R 12 , R 1 to R 3 , and a to c are as defined in formula 1.
• X 1 represents NR 11 , O, S, or CR 21 R 22 , and R 21 and R 22 , each independently, represent an unsubstituted (C1-C 6 )alkyl
• R 11 and R 12 each independently, are represented by -L-Ar
• L represents a single bond, an unsubstituted (C6-C18)arylene, or an unsubstituted (5- to 20-membered)heteroarylene
• Ar represents a (C6-C18)aryl unsubstituted or substituted with a (C1-C6)alkyl or a cyano, a (5- to 20-membered)heteroaryl unsubstituted or substituted with a (C6-C18)aryl, or an unsubstituted di(C6-C18)arylamino
• R 1 to R 3 each independently, represent an unsubstituted (C6
• the compound represented by formula 1 may be represented by any one of the following formulas 7 to 15.
• R 11 and R 12 are as defined in formula 1. According to one embodiment of the present disclosure, in formulas 7 to 15, R 11 and R 12 , each independently, are any one selected from the group consisting of the following R aa , to R bi .
• the compound represented by formula 1 may be exemplified by any one selected from the following compounds C1-1 to C7-48, but is not limited thereto.
• Each of the following compounds C1-1 to C7-48 is represented by any one of the above-mentioned formulas 7 to 15, wherein R 11 and R 12 , each independently, are defined as any one of R aa to R bi .
• the heteroaryl(ene) may contain at least one heteroatom selected from B, N, O, S, Si, and P.
• the heteroatom may be bonded to at least one selected from the group consisting of hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (5- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted
• (C1-C30)alkyl(ene) is meant to be a linear or branched alkyl(ene) having 1 to 30 carbon atoms constituting the chain, in which the number of carbon atoms is preferably 1 to 20, and more preferably 1 to 10.
• the above alkyl may include methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, tert-butyl, etc.
• (C2-C30)alkenyl is meant to be a linear or branched alkenyl having 2 to 30 carbon atoms constituting the chain, in which the number of carbon atoms is preferably 2 to 20, and more preferably 2 to 10.
• the above alkenyl may include vinyl, 1-propenyl, 2-propenyl, 1-butenyl, 2-butenyl, 3-butenyl, 2-methylbut-2-enyl, etc.
• (C2-C30)alkynyl is meant to be a linear or branched alkynyl having 2 to 30 carbon atoms constituting the chain, in which the number of carbon atoms is preferably 2 to 20, and more preferably 2 to 10.
• the above alkynyl may include ethynyl, 1-propynyl, 2-propynyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-methylpent-2-ynyl, etc.
• (C3-C30)cycloalkyl(ene) is meant to be a mono- or polycyclic hydrocarbon having 3 to 30 ring backbone carbon atoms, in which the number of carbon atoms is preferably 3 to 20, and more preferably 3 to 7.
• the above cycloalkyl may include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, etc.
• (3- to 7-membered)heterocycloalkyl is meant to be a cycloalkyl having 3 to 7, preferably 5 to 7, ring backbone atoms, and including at least one heteroatom selected from the group consisting of B, N, O, S, Si, and P, and preferably the group consisting of O, S, and N.
• the above heterocycloalkyl may include tetrahydrofuran, pyrrolidine, thiolan, tetrahydropyran, etc.
• (C6-C30)aryl(ene) is meant to be a monocyclic or fused ring radical derived from an aromatic hydrocarbon having 6 to 30 ring backbone carbon atoms, in which the number of the ring backbone carbon atoms is preferably 6 to 25, more preferably 6 to 18.
• the above aryl(ene) may be partially saturated, and may comprise a spiro structure.
• the above aryl may include phenyl, biphenyl, terphenyl, naphthyl, binaphthyl, phenylnaphthyl, naphthylphenyl, phenylterphenyl, fluorenyl, phenylfluorenyl, benzofluorenyl, dibenzofluorenyl, phenanthrenyl, phenylphenanthrenyl, anthracenyl, indenyl, triphenylenyl, pyrenyl, tetracenyl, perylenyl, chrysenyl, naphthacenyl, fluoranthenyl, spirobifluorenyl, etc.
• (3- to 30-membered)heteroaryl(ene) is an aryl having 3 to 30 ring backbone atoms, and including at least one, preferably 1 to 4 heteroatoms selected from the group consisting of B, N, O, S, Si, and P.
• the above heteroaryl(ene) may be a monocyclic ring, or a fused ring condensed with at least one benzene ring; may be partially saturated; may be one formed by linking at least one heteroaryl or aryl group to a heteroaryl group via a single bond(s); and may comprise a spiro structure.
• the above heteroaryl may include a monocyclic ring-type heteroaryl such as furyl, thiophenyl, pyrrolyl, imidazolyl, pyrazolyl, thiazolyl, thiadiazolyl, isothiazolyl, isoxazolyl, oxazolyl, oxadiazolyl, triazinyl, tetrazinyl, triazolyl, tetrazolyl, furazanyl, pyridyl, pyrazinyl, pyrimidinyl, and pyridazinyl, and a fused ring-type heteroaryl such as benzofuranyl, benzothiophenyl, isobenzofuranyl, dibenzofuranyl, dibenzothiophenyl, benzimidazolyl, benzothiazolyl, benzoisothiazolyl, benzoisoxazolyl, benzoxazolyl, isoindolyl
• substituted in the expression “substituted or unsubstituted” means that a hydrogen atom in a certain functional group is replaced with another atom or another functional group, i.e. a substituent.
• the substituents are at least one selected from the group consisting of a cyano, a (C1-C20)alkyl, and a (C6-C25)aryl.
• the substituents, each independently are at least one selected from the group consisting of a cyano, a (C1-C10)alkyl, and a (C6-C18)aryl.
• the substituents, each independently are at least one selected from the group consisting of a cyano, a methyl, a phenyl, and a biphenyl.
• the compound of formula 1 according to the present disclosure may be produced by a synthetic method known to one skilled in the art, and for example, as shown in the following reaction schemes 1 and 2, but is not limited thereto.
• the organic electroluminescent material of the present disclosure may include at least one compound represented by formula 1.
• the organic electroluminescent compound represented by formula 1 may be comprised in the light-emitting layer, but is not limited thereto.
• the organic electroluminescent compound of formula 1 may be comprised as a host.
• the light-emitting layer may further comprise at least one dopant. If necessary, another compound besides the organic electroluminescent compound of formula 1 may be further comprised as a second host material.
• the organic electroluminescent material of the present disclosure is a host material, and the host material comprises at least one first host compound and at least one second host compound, and the first host compound may be represented by formula 1.
• the weight ratio of the first host material to the second host material is in the range of 1:99 to 99:1.
• the second host material may include any one of the compounds represented by the following formulas 21 to 24, but is not limited thereto.
• Ma represents a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted mono- or di-(C6-C30)arylamino, or a substituted or unsubstituted (3- to 30-membered)heteroaryl;
• La represents a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene;
• A represents S, O, NR 7 , or CR 8 R 9 ;
• Ra to Rd each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted (C2-C30)alkynyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C60)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or
• R 7 to R 9 each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri(C6
• X 11 to X 13 each independently, represent N or CRg, with a proviso that at least one of X 11 to X 13 represent N;
• Lb represents a substituted or unsubstituted C10 arylene
• Ar 11 , Ar 12 , and Re to Rg each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubsti
• Ar 13 to Ar 15 each independently, represent a substituted or unsubstituted (C6-C30)aryl
• n, m, u, and x each independently, represent an integer of 1 to 4
• v represents an integer of 1 to 3
• y represents an integer of 1 to 6, where if n, m, u, v, x, or y, each independently, is an integer of 2 or more, each of Ra to Rf may be the same or different, and
• the heteroaryl contains at least one heteroatom selected from B, N, O, S, Si, and P.
• the compound represented by any one of formulas 21 to 24 includes the following compounds, but is not limited thereto.
• TPS represents a triphenylsilyl group.
• the dopant comprised in the organic electroluminescent device of the present disclosure is preferably at least one phosphorescent dopant.
• the phosphorescent dopant material applied to the organic electroluminescent device of the present disclosure is not particularly limited, but may be preferably selected from the metallated complex compounds of iridium (Ir), osmium (Os), copper (Cu), and platinum (Pt), more preferably selected from ortho-metallated complex compounds of iridium (Jr), osmium (Os), copper (Cu), and platinum (Pt), and even more preferably ortho-metallated iridium complex compounds.
• the dopant comprised in the organic electroluminescent device of the present disclosure may comprise the compound represented by the following formula 101, but is not limited thereto.
• L 1 is selected from the following structures 1 and 2:
• R 100 to R 103 each independently, represent hydrogen, deuterium, a halogen, a (C1-C30)alkyl unsubstituted or substituted with deuterium or a halogen, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C30)aryl, a cyano, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or a substituted or unsubstituted (C1-C30)alkoxy; or may be linked to adjacent R 100 to R 103 , to form a substituted or unsubstituted fused ring, e.g., a substituted or unsubstituted, quinoline, benzofuropyridine, benzothienopyridine, indenopyridine, benzofuroquinoline, benzothienoquinoline or indenoquinoline ring;
• R 104 to R 107 each independently, represent hydrogen, deuterium, a halogen, a (C1-C30)alkyl unsubstituted or substituted with deuterium or a halogen, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a cyano, or a substituted or unsubstituted (C1-C30)alkoxy; or may be linked to adjacent R 104 to R 107 to form a substituted or unsubstituted fused ring, e.g., a substituted or unsubstituted, naphthyl, fluorene, dibenzothiophene, dibenzofuran, indenopyridine, benzofuropyridine or benzothienopyridine ring;
• R 201 to R 211 each independently, represent hydrogen, deuterium, a halogen, a (C1-C30)alkyl unsubstituted or substituted with deuterium or a halogen, a substituted or unsubstituted (C3-C30)cycloalkyl, or a substituted or unsubstituted (C6-C30)aryl; or may be linked to adjacent R 201 to R 211 to form a substituted or unsubstituted fused ring; and
• n an integer of 1 to 3.
• dopant compound is as follows, but are not limited thereto.
• Comparative Example 1 Producing a Red Light-Emitting OLED not According to the Present Disclosure
• An OLED not according to the present disclosure was produced as follows: A transparent electrode indium tin oxide (ITO) thin film (10 ⁇ /sq) on a glass substrate for an OLED (GEOMATEC CO., LTD., Japan) was subjected to an ultrasonic washing with acetone and isopropyl alcohol, sequentially, and then was stored in isopropanol.
• the ITO substrate was mounted on a substrate holder of a vacuum vapor deposition apparatus.
• Compound HI-1 was introduced into a cell of the vacuum vapor deposition apparatus, and then the pressure in the chamber of the apparatus was then controlled to 10 ⁇ 7 torr.
• compound HI-2 was introduced into another cell of the vacuum vapor deposition apparatus and was evaporated by applying an electric current to the cell, thereby forming a second hole injection layer having a thickness of 5 nm on the first hole injection layer.
• Compound HT-1 was then introduced into another cell of the vacuum vapor deposition apparatus and was evaporated by applying an electric current to the cell, thereby forming a first hole transport layer having a thickness of 10 nm on the second hole injection layer.
• Compound HT-3 was then introduced into another cell of the vacuum vapor deposition apparatus and was evaporated by applying an electric current to the cell, thereby forming a second hole transport layer having a thickness of 60 nm on the first hole transport layer.
• a light-emitting layer was formed thereon as follows: Compound C was introduced into one cell of the vacuum vapor depositing apparatus as a host, and compound D-39 was introduced into another cell as a dopant.
• the two materials were evaporated at a different rate and the dopant was deposited in a doping amount of 3 wt % based on the total amount of the host and dopant to form a light-emitting layer having a thickness of 40 nm on the second hole transport layer.
• Compound ET-1:compound EI-1 as an electron transport material was then deposited on the light-emitting layer at a weight ratio of 50:50 to form an electron transport layer having a thickness of 35 nm.
• an Al cathode having a thickness of 80 nm was deposited on the electron injection layer by another vacuum vapor deposition apparatus.
• an OLED was produced. All the compounds used for producing the OLED were purified by vacuum sublimation at 10 ⁇ 6 torr.
• An OLED was produced in the same manner as in Comparative Example 1, except that compound C1-61 was used as a host.
• OLEDs were produced in the same manner as in Comparative Example 1, except that compound HT-2 instead of compound HT-3 was used in the second hole transport layer, and the compound as shown in Table 1 below was used as a host.
• OLEDs were produced in the same manner as in Comparative Example 1, except that compound HT-2 was used in the second hole transport layer, the first and second hosts, not a single host, shown in Tables 2 and 3 were introduced into different cells so as to have a weight ratio of 50:50, and the dopant was deposited in a doping amount of 3 wt % based on the total amount of the hosts and the dopant to form a light-emitting layer having a thickness of 40 nm on the second hole transport layer.
• OLEDs were produced in the same manner as in Comparative Example 1, except that compound HT-2 was used in the second hole transport layer, and only the second host shown in Table 2 or 3 was used as a host.
• the driving voltage and power efficiency at 5,000 nits were measured.
• the lifespan (T98), the time taken to be reduced from 100% to 98% of the luminance, based on a luminance of 5,000 nits of the produced OLEDs are shown in Tables 2 and 3 below.
• the OLED produced by using the organic electroluminescent compound of the present disclosure as a host has a driving voltage lower by 15% or more as compared to the OLED produced by using a conventional compound as a host. From this, it can be seen that the same battery may be used longer, since the use of the organic electroluminescent compound of the present disclosure in a consumer electronic product requiring low power, in particular, a portable display such as a cellular phone, has a lower power consumption than that in the case of using a conventional compound as a host.
• the OLEDs in which the organic electroluminescent compound of the present disclosure (the first host material) and the second host material of the present disclosure are codeposited are superior in driving voltage, power efficiency, and lifespan to an OLED using only the second host material of the present disclosure.

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